From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Test report on two SPRING F.363 leaf springs, detailing wear, cracks, and breakages after a time run.
| Identifier | ExFiles\Box 80\2\ scan0190 | |
| Date | 19th February 1920 | |
| X2628 SPRING F.363 - 220 lbs. - parallel leaves tapered ends - no nibs and slots - ground all over. Fitted on O.S. Bump chassis 3.8.20. No. of leaves 6. | Brinell | Remarks. | Time run. --- | --- | --- | --- 1 | 444 | 1st. leaf O.K. | 2 | 415 | 2nd. leaf cracked under rear clip. | 17 hrs. 30 mins. 3 | 415 | 3rd. leaf very small crack under rear clip | 4 | 415 | 4th. leaf cracked front of first clip! | 5 | 415 | 5th. leaf cracked front of first clip. | 6 | 415 | 6th. leaf O.K. | Spring taken off 7.8.20 SPRING F.363 - 2100 lbs. - parallel leaves, tapered ends - no nibs and slots - ground all over. Fitted to N.S. Bump Chassis 27.7.20. 1 | 444 | 1st. leaf cracked under front clip. | 16 hrs. 15 mins. 2 | 415 | 1st. leaf broken. | 18 " 35 mins. 3 | 429 | 3rd. leaf broken front of clip. | 23 " 4 | 415 | 2nd. leaf cracked front of clip. | 25 " 45 " 5 | 415 | 4th. leaf cracked under front clip. | 6 | 444 | 5th. and 6th. leaves O.K. | Spring taken off 7.8.20. Vertical text on right margin: R.R. 235a (100 T.) S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 543. 19-2-20 G 2618 | ||